Marieke van Son

170 CHAPTER 9 Figure 6 – Dose distribution second MRI-guided focal salvage HDR-BT Transversal plane (upper MR image) and sagittal plane (lower MR image) showing delineations of the bladder (purple), urethra (yellow), rectum (green), prostate (red), gross tumor volume (GTV, blue), and clinical target volume (CTV, orange) in the left dorsal peripheral zone. The images show signal voids from the catheters and previously implanted iodine 125 seeds. On the sagittal image, one of the catheters is visible within the CTV. Radiation dose is displayed in colors, with red representing 19Gy and green representing 9.5Gy.